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The previous logic wouldn't work when the model included hard limits e.g. in this model, the average concentration is not meant to exceed 9mg/L. When the Model runs for the entire Weir, we can see this is true on average:
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But when we look per division, we can see that some divisions drop to 0 while others can reach double the cap 18.
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Changing the logic for weirs to be consistent with storage routing resolves this issue since the cap is applied in each division rather than across the entire link.

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